ArcGIS Engine 捕捉

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原文 ArcGIS Engine 捕捉

 

bool bCreateElement = true;int internalTime = 5;//時間間隔int snapTime = 10;//初始值IElement m_element = null;  //介面繪製點元素IPoint currentPoint = new PointClass();  //當前滑鼠點IPoint snapPoint = null;  //捕捉到的點IMovePointFeedback pFeedback = new MovePointFeedbackClass();public void DoMouseMove(object sender, IMapControlEvents2_OnMouseMoveEvent e){    AxMapControl axMapControl1 = sender as AxMapControl;    currentPoint.PutCoords(e.mapX, e.mapY);    if (action == ActionType.CreateFeature)    {    snapTime++;    snapTime = snapTime%internalTime ;    ILayer layer = GetLayerByName(snapLayer, axMapControl1);    IFeatureLayer m_iFeatureLyr = layer as IFeatureLayer;    if (bCreateElement)    {    CreateMarkerElement(currentPoint,axMapControl1);    bCreateElement = false;    }           if (snapPoint == null)    ElementMoveTo(currentPoint, axMapControl1);    //滑鼠自動撲獲頂點      if (snapTime == 0)    snapPoint = Snapping(e.mapX, e.mapY, m_iFeatureLyr,     axMapControl1);    if (snapPoint != null && snapTime == 0)    ElementMoveTo(snapPoint, axMapControl1);    }}/// <summary>/// 捕捉/// </summary>/// <param name=”x”></param>/// <param name=”y”></param>/// <param name=”iFeatureLyr”></param>/// <param name=”axMapControl1″></param>/// <returns></returns>public IPoint Snapping(double x, double y, IFeatureLayer iFeatureLyr, AxMapControl axMapControl1){    IPoint iHitPoint = null;    IMap iMap = axMapControl1.Map;    IActiveView iView = axMapControl1.ActiveView;    IFeatureClass iFClss = iFeatureLyr.FeatureClass;    IPoint point = new PointClass();    point.PutCoords(x,y);    double length =     ConvertPixelsToMapUnits(axMapControl1.ActiveView, 8);    ITopologicalOperator pTopo = point as ITopologicalOperator;    IGeometry pGeometry = pTopo.Buffer(length).Envelope as IGeometry;    ISpatialFilter spatialFilter = new SpatialFilterClass();    spatialFilter.GeometryField = iFeatureLyr.FeatureClass.ShapeFieldName;    spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelCrosses;    spatialFilter.Geometry = pGeometry;        IFeatureCursor cursor = iFClss.Search(spatialFilter, false);    IFeature iF = cursor.NextFeature();    if (iF == null) return null;        IPoint iHitPt = new ESRI.ArcGIS.Geometry.Point();    IHitTest iHitTest = iF.Shape as IHitTest;    double hitDist = 0;    int partIndex = 0;    int vertexIndex = 0;    bool bVertexHit = false;    // Tolerance in pixels for line hits    double tol = ConvertPixelsToMapUnits(iView, 8);    if (iHitTest.HitTest(point, tol, esriGeometryHitPartType.esriGeometryPartBoundary, iHitPt, ref hitDist, ref partIndex, ref vertexIndex, ref bVertexHit))    {　　　　iHitPoint = iHitPt;    }    axMapControl1.ActiveView.Refresh();    return iHitPoint;}/// <summary>/// 建立新的element用於顯示/// </summary>/// <param name=”point”></param>/// <param name=”axMapControl1″></param>public void CreateMarkerElement(IPoint point, AxMapControl axMapControl1){    IActiveView iView = axMapControl1.ActiveView;    IGraphicsContainer iGraphContainer = axMapControl1.Map as IGraphicsContainer;    //建立一個marker元素    IMarkerElement iMarkerElement = new MarkerElement() as IMarkerElement;    ISimpleMarkerSymbol iSym = new SimpleMarkerSymbol();    //符號化元素    IRgbColor iColor = new RgbColor();    iColor.Red = 0;    iColor.Blue = 100;    iColor.Green = 255;    iSym.Color = iColor;    IRgbColor iColor2 = new RgbColor();    iColor2.Red = 0;    iColor2.Blue = 0;    iColor2.Green = 0;    iSym.Outline = true;    iSym.OutlineColor = iColor2 as IColor;    iSym.OutlineSize = 1;    iSym.Size = 5;    iSym.Style. = esriSimpleMarkerStyle.esriSMSCircle;    ISymbol symbol = iSym as ISymbol;    symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;    iMarkerElement.Symbol = iSym;    m_element = iMarkerElement as IElement;    m_element.Geometry = point as IGeometry;    iGraphContainer.AddElement(m_element, 0);    iView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, m_element, null);    IGeometry iGeo = m_element.Geometry;    pFeedback.Display = iView.ScreenDisplay;    pFeedback.Symbol = iSym as ISymbol;    pFeedback.Start(iGeo as IPoint, point);}/// <summary>/// 移動元素/// </summary>/// <param name=”iPt”></param>/// <param name=”axMapControl1″></param>public void ElementMoveTo(IPoint iPt, AxMapControl axMapControl1){    //移動元素    pFeedback.MoveTo(iPt);    IGeometry iGeo1 = null;    IGeometry iGeoResult;    if (m_element != null)    {　　iGeo1 = m_element.Geometry;　　iGeoResult = pFeedback.Stop();　　//map.ActiveView.Refresh();　　m_element.Geometry = iGeoResult;　　//更新該元素的位置　　axMapControl1.ActiveView.GraphicsContainer.UpdateElement(m_element);　　//重新移動元素　　pFeedback.Start(iGeo1 as IPoint, iPt);　　//map.ActiveView.Refresh();　　axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);    }}public ILayer GetLayerByName(string layerName, AxMapControl axMapControl1){    for (int i = 0; i < axMapControl1.LayerCount; i++)    {　　 if (axMapControl1.get_Layer(i).Name.Equals(layerName))    　　return axMapControl1.get_Layer(i);    }    return null;}public double ConvertPixelsToMapUnits(IActiveView pActiveView, double pixelUnits){    double realWorldDisplayExtent;    int pixelExtent;    double sizeOfOnePixel;    pixelExtent = pActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame().right – pActiveView.ScreenDisplay.DisplayTransformation.get_DeviceFrame().left;    realWorldDisplayExtent = pActiveView.ScreenDisplay.DisplayTransformation.VisibleBounds.Width;    sizeOfOnePixel = realWorldDisplayExtent / pixelExtent;    return pixelUnits * sizeOfOnePixel;}

 

ArcGIS Engine 捕捉